JP2001009691A - Lens chamfering processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for strictly controlling the moving speed and the moving amount of a grinding wheel, to prevent the occurrence of pitching on a lens chamfering portion, and to keep the width of the chamfering portion constant even when the periphery of the lens is eccentric with reference to rotation axis, by setting the positional relationship of the grinding wheel and the lens constant at the time of processing. SOLUTION: A lens chamfering processing method for chamfering a peripheral edge 1b of a lens 1 comprises steps of rotating grinding wheel 5 and the lens 1 wherein abrasive is held by an elastic material uniting material; abutting the grinding wheel 5 against the peripheral edge 1b of the lens 1 to fix in a state elastically deformed; and processing the peripheral edge 1b of the lens 1 until elastic deformation of the grinding wheel 5 is restored to its original state with fixing the positional relationship of the grinding wheel 5 and the lens 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens chamfering method for chamfering the periphery of a lens.

[0002]

2. Description of the Related Art There are various methods for chamfering the periphery of a lens.
There is a method using a lens chamfering device described in Japanese Patent No. 80550. FIG. 10 is a sectional view showing the chamfering device.
A rotatable grindstone shaft 36 for detachably holding a substantially conical grindstone 35 whose top is cut off, and a rotatable work shaft 33 having a chuck 34 for holding a lens 31 to be machined are respectively centered. The axes 36a and 33a are provided so as to intersect. By providing moving means for moving the grindstone shaft 36 in the direction of its central axis 36a, the grindstone shaft 36 is moved and the conical surface of the grindstone 35 can be brought into contact with the peripheral edge 31b of the lens 31. .

The moving means comprises a base 41 for fixedly supporting a work shaft support 37 for rotatably holding the work shaft 33.
It is provided in. The moving means extends in the direction of the central axis 36a of the grindstone shaft 36, and includes a guide groove 41a for movably holding a grindstone shaft support 38 for rotatably holding the grindstone shaft 36 about the central axis 36a; And a feed screw 42 screwed to the protrusion 38a of the base 38 and arranged in the direction of the central axis 36a, and supported by the support arm 41b of the base 41, and connected to one end of the feed screw 42 to rotate the feed screw 42. Motor 43. By driving the moving motor 43, the feed screw 42 is rotated, and the grindstone shaft support 38 can be moved forward and backward by an arbitrary amount at an arbitrary speed in the direction of the center axis 36a along the guide groove 41a. At this time, the grindstone 35 and the grindstone shaft 36 move the same as the grindstone shaft support 38. Note that a manual handle may be provided instead of the moving motor 43, and the feed screw 42 may be rotated by manually turning the manual handle.

When the lens 31 is chamfered, first, the work shaft 33 is rotated about its center axis 33a by the work shaft drive motor 39 to rotate the lens 31. Further, while rotating the grindstone 35 by rotating the grindstone 35 by rotating the grindstone shaft 36 around its central axis 36a by the grindstone axis drive motor 40, the moving motor 43 of the moving means is driven toward the work axis 33 along the central axis 36a. Move. At this time, rapid advance is performed until the grindstone 35 held by the grindstone shaft 36 approaches the lens 31 held by the work shaft 33, and thereafter, the grindstone 35 is brought into contact with the lens 31 at a very low speed, and the feed is continued. By doing so, the peripheral edge 31b of the lens 31 is chamfered.

[0005]

In the chamfering process using the chamfering device shown in FIG. 10, the grindstone 35 is rapidly moved by the moving means until it comes close to the lens 31, from which the grindstone 35 is moved.
Is abutted against the lens 31 and is fed at a very low speed in order to grind a predetermined chamfer amount. In this moving means, the whetstone 35
The lens 3 is moved by a feed screw 42 for moving the lens forward and backward by an arbitrary moving amount, and a moving motor 43 or a manual hand for rotating the feed screw 42 at an arbitrary speed by an arbitrary moving amount.
It is necessary to move the grindstone 35 at an arbitrary feed speed and an arbitrary amount of movement during the chamfering process.

Further, at the time of machining, the moving speed and the moving amount of the fast-feeding of the grindstone 35 and the moving speed and the moving amount of the fine-speed feeding must be finely controlled. Many. In addition, when this movement is automatically managed, a computer or software for controlling the movement is required.

Further, when the grindstone 35 is in contact with the lens 31, especially when the moving speed of the grindstone 35 for grinding the lens 31 is not sufficiently small, the lens 31
Since excessive force is applied to the peripheral edge 31b of the chamfered portion 31
Pitching and chipping tend to occur in c.

[0008] Further, the grinding stone 3 in the spark-out processing
Even when the position of 5 is constant, when the peripheral edge 31b of the lens 31 is eccentric with respect to the center axis 33a of the work shaft 33, the portion of the peripheral edge 31b of the lens 31 protruding toward the grindstone 35 has a large amount of grinding, The width of the formed chamfered portion 31c is not constant.

The present invention has been developed in view of the above-mentioned problems of the prior art, and eliminates the need to finely set the moving speed and moving amount of a grindstone or a lens, and keeps the positional relationship between the grindstone and the lens during processing constant. By eliminating the need to finely control the moving speed and amount of movement of the grindstone, it is possible to prevent pitching from occurring in the chamfered part of the lens, and even if the periphery of the lens is slightly eccentric with respect to the rotation axis. It is an object of the present invention to provide a method of chamfering a lens that can keep a width of a chamfered portion constant and does not cause uneven wear of a grindstone.

[0010]

According to a first aspect of the present invention, there is provided a lens chamfering method for chamfering a peripheral edge of a lens, comprising the steps of: A step of rotating the grindstone holding the grains and the lens, a step of abutting the grindstone on the periphery of the lens and fixing it in an elastically deformed state, and fixing a positional relationship between the grindstone and the lens Machining the peripheral edge of the lens until the elastic deformation of the grinding wheel is restored.

According to a second aspect of the present invention, in the method of chamfering a lens according to the first aspect, in the step of processing the periphery of the lens, the step of processing the periphery of the lens includes the step of: It is characterized in that the tangent to the whetstone surface of the whetstone is made orthogonal.

Further, a lens chamfering method according to claim 3 of the present invention is the lens chamfering method according to claim 1 or 2, wherein the whetstone has a disk shape.

In the structure of the first aspect, the grindstone and the lens are rotated, and the grindstone is brought into contact with the periphery of the lens to fix the positional relationship between the grindstone and the lens. The grindstone in contact with the lens is elastically deformed, and the contact portion of the grindstone in contact with the peripheral edge of the lens is elastically dented. If the processing is continued while the positional relationship between the grindstone and the lens is fixed, the abutting portion of the elastically dented grindstone processes the periphery of the lens by the elastic restoring force. As the periphery of the lens is chamfered, the amount of dent at the contact portion due to the elastic deformation of the grindstone decreases, and the processing is continued until the elastic deformation of the grindstone is restored. That is, the positional relationship between the grindstone and the lens is fixed, and the lens is chamfered by a force that allows the grindstone to elastically return without moving the grindstone during processing. Further, the contact portion of the grindstone is easily elastically deformed and does not apply an excessive load to the periphery of the lens, so that pitching of the chamfered portion is prevented. Further, when the periphery of the lens is slightly eccentric with respect to the rotation axis, the dent of the contact portion of the grinding stone in this portion at the periphery of the lens protruding toward the grinding stone during processing is easily large. As a result, the periphery of the lens is prevented from being excessively ground, and the width of the chamfer becomes substantially constant.

Further, the configuration of claim 2 has the same operation as that of claim 1. Furthermore, if the tangent to the periphery of the lens and the tangent to the grindstone surface of the grindstone are perpendicular to each other, the entire grindstone surface of the grindstone abuts on the periphery of the lens during processing, thereby preventing the wear amount of the grindstone surface from being partially increased. Also, adjust the fixed position between the whetstone and the lens to change the angle of the tangent to the periphery of the lens,
Adjust the chamfer angle.

Further, the configuration of claim 3 has the same operation as that of claim 1 or 2. Further, the weight of the grinding wheel can be reduced, and vibration due to the ubiquitous weight of the grinding wheel can be prevented.

[0016]

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS. 1, 2 and 3. FIG.

FIG. 1 is a front sectional view showing a chamfering apparatus used in the present embodiment, and the structure of the apparatus will be described below. The lens 1 is coaxially attached to the lens holding plate 2, and the work shaft 3 holds the lens holding plate 2 detachably and coaxially via the chuck 4. In other words, the lens 1 (and the central axis 1a that is the rotation axis of the lens 1), the lens holding plate 2, and the work axis 3 are
Are arranged coaxially with the center axis 3a. Work axis 3
Are supported by a work shaft support 7 via a bearing 10, and are connected to the work shaft 3 by a work shaft drive motor 2.
1 rotates the lens 1 around the central axis 1a via the lens holding plate 2 to rotate the lens 1 around the central axis 1a. Here, the work shaft support 7, the bearing 10, and the work shaft drive motor 21 are the first for rotating the lens 1.
Of the rotating mechanism. The same applies to the following embodiments.

On the other hand, the grindstone shaft 6 holds the substantially conical grindstone 5 detachably and coaxially. In other words, the grindstone 5 (and the center axis 5a which is the rotation axis of the grindstone 5) and the grindstone shaft 6 are arranged coaxially with the center axis 6a of the grindstone shaft 6.
The grindstone shaft 6 is supported by a grindstone shaft support 8 via a bearing 11, and is rotated around a center axis 6 a by a grindstone shaft drive motor 22 connected to the grindstone shaft 6.
Is rotated around the central axis 5a. Here, the grinding wheel shaft support 8, the bearing 11, and the grinding wheel shaft drive motor 22
Constitutes a second rotation mechanism for rotating. The same applies to the following embodiments.

The center axis 3a of the work shaft 3 is set in the horizontal direction, and the center axis 6a of the grinding wheel shaft 6 is set in the vertical direction. The center axis 3a and the center axis 6a are arranged so as to be orthogonal to each other. In this state, the direction of the central axis 3a (horizontal direction) is referred to as an X direction, and the direction of the central axis 6a (vertical direction) is referred to as a Z direction.

The grindstone shaft support 8 is fixed to an advance / retreat mechanism (not shown). The advancing / retreating mechanism is connected to a lever (not shown) that can be fixed by moving the grindstone shaft support 8 in the direction of the center axis 6a (Z-axis direction) of the grindstone shaft 6 by falling down to two places at both ends. That is, when the lever is tilted in one direction (first direction), the grindstone shaft support 8 moves in the Z direction (downward) and is fixed at a position where the peripheral edge 1b of the lens 1 and the grindstone 5 come into contact with each other to perform processing. The positional relationship between the grindstone 5 and the lens 1 is also fixed. Adjustment of the positional relationship between the lens 1 and the grindstone 5 when it comes into contact is performed in advance by adjusting the position at which the grindstone shaft support 8 is fixed to the advance / retreat mechanism. Also, move the lever to the other side (second direction)
When this is done, the grindstone shaft support 8 moves in the Z direction (upward) and is fixed at a position where the lens 1 and the grindstone 5 are separated without interference.

The grindstone 5 has a substantially conical shape in which the top of the cone is cut, and the vicinity of the grindstone surface 5c having the conical surface has a structure in which diamond abrasive grains are bonded by a bonding material made of an elastic material such as urethane rubber. . By using a material having a different elastic modulus for the binder of the grindstone 5, the grindstone surface 5c of the grindstone 5 is used.
Can increase or decrease the pressure applied to the peripheral edge 1b of the lens 1 with which the lens abuts.

Next, a method of chamfering a lens according to the present embodiment using the chamfering apparatus will be described with reference to FIGS. 2A and 2B are front cross-sectional views showing a processing step of the present embodiment. FIG. 2A shows a step of rotating a grindstone and a lens, and FIG. 2B shows a step in which the grindstone is brought into contact with the peripheral edge of the lens to be elastically deformed. FIG. 2C shows a step of processing the periphery of the lens. FIG. 3 is an enlarged cross-sectional view showing the contact portion between the periphery of the lens and the grindstone at the time of chamfering. FIG. 3 (a) is the state of FIG. 2 (b), and FIG. 3 (b) is FIG. 2 (c). The state of is shown.

First, the lens 1 and the grindstone 5 shown in FIG.
The work axis drive motor 21 and the grindstone axis drive motor 22 are operated in an initial state in which the work axis drive motor 21 and the grindstone axis drive motor 22 are operated in a state in which the lever of the advance / retreat mechanism of the grindstone axis support 8 is tilted in the second direction.
The lens 1 and the grindstone 5 are started to rotate around their respective central axes 1a, 5a.

Next, the lever of the advance / retreat mechanism of the grinding wheel shaft support 8 is tilted to the opposite side (first direction) of the second direction, and the grinding wheel 5 is moved together with the grinding wheel shaft support 8 via the grinding wheel shaft 6. Lens 1
2B, the edge 1b of the lens 1 is brought into contact with the grindstone surface 5c of the grindstone 5 to fix the grindstone shaft support 8 at a position where chamfering is performed, and as shown in FIG. Is elastically deformed. That is, the contact portion 5 of the grindstone 5 where the peripheral edge 1b of the lens 1 is in contact with the grindstone surface 5c of the grindstone 5
3B, an elastic dent shown in FIG. 3A is generated by being pressed by the peripheral edge 1b of the lens 1. Since the grindstone 5 rotates around the central axis 5a, the concave contact portion 5b
Moves sequentially on the grindstone surface 5c, and since the lens 1 is rotating around the central axis 1a, the peripheral edge 1b of the lens 1 that comes into contact with the contact portion 5b moves.

When the chamfering is continued without moving the grindstone 5 while the positional relationship between the grindstone 5 and the lens 1 is fixed, the peripheral edge 1b of the lens 1 is gradually ground by the contact portion 5b of the grindstone 5. , A chamfered portion 1c around the entire periphery 1b
Is formed, the elastic dent of the contact portion 5b gradually becomes smaller and is restored according to the chamfer amount of the peripheral edge 1b. Then, as shown in FIG. 2C, the peripheral edge of the lens 1 is processed until the elastic deformation of the grindstone 5 is restored. When the elastic deformation of the grindstone 5 is restored, the grinding of the peripheral edge 1b of the lens 1 does not proceed any more, and as shown in FIG.

Finally, the lever of the advancing / retreating mechanism of the grindstone shaft support 8 is tilted in the second direction, and the grindstone shaft support 8 is moved to return the grindstone 5 to a position away from the lens 1. Then, the grindstone shaft driving motor 22 is stopped, and a series of processing steps for chamfering the lens 1 are completed.

In this embodiment, the lens 1 is fixed at a fixed position (spark-out position) during the chamfering of the lens 1 without changing the positional relationship between the grindstone 5 and the lens 1. When the grindstone 5 comes into contact with the peripheral edge 1b of the lens 1, the contact portion 5b of the grindstone 5 is elastically dented as shown in FIG.
When the peripheral edge 1b of the lens 1 is ground by the grindstone 5 while rotating the grindstone 5 and the lens 1, the elastic dent of the contact portion 5b decreases (restores) according to the amount of grinding. A chamfered portion 1c is formed on a peripheral edge 1b of the device. That is, the positional relationship between the grindstone 5 and the lens 1 is fixed, and the lens 1 can be chamfered by the elastic return force of the grindstone 5 without moving the grindstone 5. Also, with respect to a slight displacement of the positional relationship between the peripheral edge 1b of the lens 1 and the contact portion 5b of the grindstone 5, the amount of elastic deformation of the contact portion 5b changes by a small amount and absorbs the displacement. Further, due to the elastic deformation of the grindstone 5, the load applied to the peripheral edge 1b of the lens 1 at the contact portion 5b is dispersed. In addition, the magnitude of the pressure applied by the grindstone 5 to the peripheral edge 1b of the lens 1 is changed by using a binding material having a different elastic modulus for holding the abrasive grains.

According to the present embodiment, the chamfering can be performed while the positional relationship between the lens 1 and the grindstone 5 is fixed without moving the lens 1 or the grindstone 5 during the chamfering. Therefore, the apparatus for performing the chamfering method of the present embodiment does not need to have a mechanism for moving the grindstone 5 or the lens 1 during the chamfering processing, and the processing apparatus can be simplified.

Further, during the chamfering process, the trouble of managing the moving amount and the moving speed of the grindstone 5 or the lens 1 can be omitted. Further, the whetstone 5 can be replaced by the whetstone 5 having a different elastic modulus of the elastic material binder holding the abrasive grains without changing the configuration of the processing apparatus.
The magnitude of the pressure applied to b can be changed. Further, the vibration generated during the chamfering can be absorbed by the elasticity of the grindstone 5. Further, it is possible to suppress occurrence of pitching when the grindstone 5 comes into contact with the periphery of the lens 1. Further, the peripheral edge 1b of the lens 1 is connected to the rotation axis (the center axis 1).
a, 3a), the beveling width of the lens 1 can be kept substantially constant by being absorbed by the elasticity of the grindstone 5.

In this embodiment, the shape of the grindstone 5 is a substantially conical shape obtained by cutting off the top of the cone, but the shape of the grindstone 5 may be conical.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIGS.

FIG. 4 is a front sectional view showing a chamfering apparatus used in the present embodiment. This chamfering device is provided with a grindstone shaft angle setting mechanism (not shown) on the grindstone shaft support 8 configured similarly to the grindstone shaft support 8 of the chamfering device (hereinafter, referred to as the device in FIG. 1) used in the first embodiment. And the point that the shape of the grindstone 5 has been changed is different from the configuration of the apparatus of FIG.
Other configurations are the same as those of the apparatus shown in FIG.

The grindstone 5 is formed by combining abrasive grains with an elastic material bonding material as in the first embodiment, and has a columnar shape (a disc shape thicker than the chamfer width). The grindstone 5 is detachably held at the tip of a grindstone shaft 6 rotatably held on a grindstone shaft support 8 via a bearing 11, and the central axis 5a of the grindstone 5 and the central axis 6a of the grindstone shaft 6 are coaxial. The outer peripheral surface thereof is a grindstone surface 5c which comes into contact with the peripheral edge 1b of the lens 1 and is chamfered. The grindstone surface 5c
The central axis 5a of the grinding wheel 5 and the central axis 6a of the grinding wheel shaft 6 are parallel to each other. The grindstones 5 have different outer diameters and thicknesses for the lenses 1 having different sizes and shapes, and the grindstone surface 5c of the grindstone 5 is in contact with the peripheral edge 1b of the lens 1. The elasticity of the grindstone 5 can be increased or decreased by changing the outer diameter and thickness of the grindstone 5 and the material of the elastic material binder.

The grindstone shaft angle setting mechanism can fix the grindstone shaft support 8 by inclining the center axis 6a of the grindstone shaft 6 arbitrarily in the XZ plane. That is,
The center axis 5a of the grindstone 5 and the center axis 1a of the lens 1 are inclined at a desired angle θ, and the grindstone surface 5c of the grindstone 5 is
Can be inclined in accordance with the chamfer angle to be machined on the peripheral edge 1b.

Next, a method of chamfering a lens according to the present embodiment using the chamfering apparatus will be described with reference to FIGS. 5A and 5B are front cross-sectional views showing the processing steps of the present embodiment. FIG. 5A shows a step of rotating a grindstone and a lens, and FIG. FIG. 5C shows a step of processing the peripheral edge of the lens.

First, the grindstone shaft support 8 is tilted by the grindstone shaft angle setting mechanism, and as shown in FIG.
The center axis 5a of the lens 1 and the center axis 1a of the lens 1 are set to have a desired angle θ, and the grindstone surface 5c of the grindstone 5 is inclined and arranged in accordance with the chamfer angle to be processed on the peripheral edge 1b of the lens 1. The lens 1 and the grindstone 5 are rotated around their respective central axes 1a and 5a by the drive motor 21 and the grindstone shaft drive motor 22.

Next, the grindstone 5 is moved by an advance / retreat mechanism (not shown) of the grindstone shaft support 8 so that the grindstone surface 5c of the grindstone 5 contacts the peripheral edge 1b of the lens 1 while maintaining the inclined state of the grindstone 5, and FIG. As shown in (b), the grindstone 5 is brought into contact with the peripheral edge 1b of the lens 1 and the contact portion 5b of the grindstone 5 is fixed in an elastically deformed state.

Then, with the positional relationship between the grindstone 5 and the lens 1 fixed, as shown in FIG. 5C, processing of the peripheral edge 1b of the lens 1 until the elastic deformation of the contact portion 5b of the grindstone 5 is restored. To form a chamfered portion 1c on the peripheral edge 1b of the lens 1. Other steps are the same as in the first embodiment.

In the present embodiment, the outer peripheral surface of the columnar (disk-shaped) grindstone 5 is used as the grindstone surface 5c, and the center axis 5a of the grindstone 5 is changed to the center axis 1a of the lens 1 by the grindstone axis angle setting mechanism. With this arrangement, the angle of the chamfered portion 1c applied to the peripheral edge 1b of the lens 1 can be set arbitrarily to enable chamfering. Also, the outer diameter of the grindstone 5,
By appropriately changing the thickness and the material of the elastic material binder, the contact position between the lens 1 and the grindstone 5 in the processing apparatus and the width of the chamfered portion 1c of the lens 1 are adjusted, and the elasticity of the grindstone 5 is adjusted. adjust. Other operations are the same as those of the first embodiment.

According to the present embodiment, the chamfer angle can be arbitrarily set using a columnar (disk-shaped) grindstone 5 without using a grindstone 5 having a different shape. Also, by changing the grindstones 5 of the lenses 1 having different shapes and sizes, chamfering can be performed by an arbitrary amount without changing the position of the lenses 1 or the grindstones 5 during processing. Other effects are the same as those of the first embodiment.

(Embodiment 3) Embodiment 3 of the present invention will be described with reference to FIG. FIG. 6 is a front cross-sectional view showing a main part of the chamfering process of the present embodiment, showing a process of processing the peripheral edge of the lens until the elastic deformation of the grindstone is restored while the positional relationship between the grindstone and the lens is fixed. I have.

The apparatus for chamfering a lens used in this embodiment is the same as the apparatus used in the second embodiment, and is formed by bonding abrasive grains with an elastic material bonding material detachably attached to the grinding wheel shaft 6. The only difference is that a disc-shaped grindstone 5 having substantially the same thickness as the width W of the chamfered portion 1c applied to the peripheral edge 1b of the lens 1 is used as the grindstone 5. As the grindstone 5, for example, a rubber grindstone with a shaft of Miniter Corporation can be used.

The method of chamfering a lens according to the present embodiment is the same as that of the second embodiment, in which a grindstone surface 5c, which is the outer peripheral surface of the grindstone 5, is brought into contact with the peripheral edge 1b of the lens 1 and elastically deformed. Then, the elastic deformation of the grindstone 5 is restored to form a chamfered portion 1 c having a width W on the peripheral edge 1 b of the lens 1.

In this embodiment, the weight of the grindstone 5 is reduced. Further, the entire grindstone surface 5c of the grindstone 5 is uniformly worn. Other operations are the same as those of the second embodiment.

According to the present embodiment, since the grindstone 5 is lightweight, it is easy to reduce the load on the processing device supporting the grindstone 5 and to prevent vibration due to the ubiquitous weight of the grindstone. . In addition, since the grinding wheel surface 5c is uniformly worn,
In particular, the grindstone 5 can be used without modifying the shape of the grindstone and without leaving the unused grindstone surface 5c. Other effects are the same as in the second embodiment.

(Embodiment 4) Embodiment 4 of the present invention will be described with reference to FIGS. FIG. 7 is a front sectional view showing a chamfering apparatus used in the present embodiment, and FIG. 8 is a left side sectional view showing a process of fixing a grindstone in an elastically deformed state by contacting the grindstone with the periphery of a lens. I have.

In the chamfering apparatus, the center axis 6a of the grinding wheel shaft 6 supported by the grinding wheel shaft support 8 in the first embodiment is in the Z direction, whereas in the present embodiment, the grinding wheel shaft support 8 supports the center axis 6a. The center axis 6a of the grinding wheel shaft 6 is oriented in a direction that is orthogonal to the direction of the center axis 3a of the work shaft 3 in the horizontal direction, that is, the Y direction. The grinding wheel 5 is a disc-shaped elastic grinding wheel similar to that of the third embodiment. Other configurations are the same as those of the apparatus shown in FIG.

Next, a method of chamfering a lens according to the present embodiment using the chamfering apparatus will be described. As in the first embodiment, the grindstone surface 5c of the rotating grindstone 5 is brought into contact with the peripheral edge 1b of the rotating lens 1, and the grindstone 5 is fixed in an elastically deformed state. At this time, the grinding wheel surface 5c of the grinding wheel 5
At a position where the tangent line abuts the peripheral edge 1b of the lens 1, the tangent line 5d of the grindstone surface 5c and the tangent line 1d of the peripheral edge 1b are orthogonal, and the circumferential speed direction of the grindstone 5 and the peripheral speed direction of the lens 1 are orthogonal. State. Then, while the positional relationship between the grindstone 5 and the lens 1 is fixed, the peripheral edge 1b of the lens 1 is chamfered until the elastic deformation of the grindstone 5 returns. Other steps are the same as in the first embodiment.

In this embodiment, if the outer diameter of the grindstone 5 is sufficiently large with respect to the width of the chamfered portion 1c of the lens 1,
The chamfered portion 1c has a substantially conical shape. At this time, the chamfer 1
The angle c is the angle between the tangent 5d of the grinding wheel surface 5c and the central axis 1a of the lens 1. And the whetstone 5 and the lens 1
The angle between the tangent 5d of the grindstone surface 5c abutting on the lens 1 and the central axis 1a of the lens 1 changes, and the angle of the chamfer 1c is adjusted. During processing, the entire grinding wheel surface 5c of the grinding wheel 5 is
Abuts uniformly on the peripheral edge 1b of the first member and wears out.
In addition, the action of causing an elastic dent in the grindstone 5 and the action of changing the contact condition of the grindstone 5 with the lens 1 by changing the grindstone 5 are the same as those in the first embodiment.

According to the present embodiment, without finely adjusting the fixing position so that the width of the grinding wheel surface 5c and the width of the chamfered portion 1c of the lens 1 match, the grinding wheel surface 5c which is the outer peripheral surface of the grinding wheel 5 is used. The whole can be worn uniformly. Then, the angle of the chamfered portion 1c of the lens 1 can be adjusted without using the grindstones 5 having different shapes and without providing an inclination angle setting mechanism for the grindstone shaft 6. Other 5
The effect due to the generation of an elastic dent and the effect of changing the contact condition of the grindstone 5 with the lens 1 by changing the grindstone 5 are the same as those in the first embodiment.

(Fifth Embodiment) A fifth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a perspective view showing a main part of the chamfering process of the present embodiment, and shows a process of processing the peripheral edge of the lens until the elastic deformation of the grindstone is restored while the positional relationship between the grindstone and the lens is fixed. .

As in the fourth embodiment, the grindstone shaft support 8 rotatably supports the grindstone shaft 6 in the Y-axis direction. The grindstone shaft 6 is sufficiently long in the axial direction, and holds two grindstones 5 having the same shape, size and material at a certain distance. The grindstone shaft 6 is rotated by the operation of the grindstone shaft drive motor 21 (see FIG. 7), and the two grindstones 5 rotate around the center axis 6a of the grindstone shaft 6 at the same speed. The two grindstones 5 are simultaneously moved by an advancing / retreating mechanism (not shown) of the grindstone shaft support 8 and are fixed to the two lenses 1 in the same positional relationship. That is, the two grindstones 5 are simultaneously fixed at a position where they contact the peripheral edge 1b of the lens 1 and perform processing, and are fixed at a position where they do not interfere with the lens 1.

On the other hand, two work shafts 3 (see FIG. 7) for holding the two lenses 1 via the lens holding plates 2 are arranged. The two workpiece shafts 3 have the same shape and are disposed at a distance substantially equal to the distance between the two grindstones 5 so that the two grindstones 5 have the same positional relationship as in the fourth embodiment. The workpiece 3 is supported by a work shaft support 7 via a bearing 10 so that the axis 3a is oriented in a direction orthogonal to the center axis 6a of the grinding wheel shaft 6 oriented in the Y direction, that is, in the X direction. The lens holding plate 2 held by the two work shafts 3 and the lens 1 attached to the lens holding plate 2 and the mechanism for rotating the work shaft 3 have the same structure.

In the method for chamfering a lens according to the present embodiment, first, two work shafts 3 are rotated around the center axis 3 by the respective work shaft drive motors 21 and the grindstone shaft 6 is rotated about the center axis 6a. Let it. Next, in this state, the grindstone shaft support 8 is moved by the advance / retreat mechanism of the grindstone shaft support 8 so that the grindstone surfaces 5c of the two grindstones 5 abut on the peripheral edges 1b of the two lenses 1 respectively. Are fixed at positions where they are elastically deformed. At this time, the whetstone 5
At the position where the grinding wheel surface 5c abuts on the peripheral edge 1b of the lens 1, the tangent to the grinding wheel surface 5c and the tangent to the peripheral edge 1b are orthogonal to each other. When the elastic deformation of the grindstone 5 is restored, the two lenses 1 are chamfered at the same time. That is, the configuration of one set of the grindstone 5 and the lens 1 is the same as that of the fourth embodiment.

In the present embodiment, two grindstones 5 abut against the two lenses 1 and chamfering is performed simultaneously. Even if the shape of the peripheral edge 1b is slightly shifted between the two lenses 1, the width of the chamfered portion 1c becomes substantially the same due to the change in the elastic dent of the grindstone 5. Other operations are the same as those of the fourth embodiment.

According to the present embodiment, two lenses 1 having the same shape can be chamfered at the same time. Other effects are similar to those of the fourth embodiment.

In the present embodiment, two sets of processing mechanisms such as the grindstone 5 and the work shaft 3 are arranged to process two lenses 1 at the same time. However, the number of processing mechanisms is three or more. A plurality of lenses 1 may be processed at the same time.

In each of the above-described embodiments, the state in which the lens 1 and the grindstone 5 are in contact with each other to perform the processing, the state in which the lens 1 and the grindstone 5
In order to set the two types of states, that is, the state in which the grinding wheel is separated from the other, a structure is used in which the grinding wheel 5 is moved forward and backward by using the moving mechanism of the grinding wheel shaft support 8 linked to the lever, but the same purpose can be achieved. May be used.

In each of the embodiments, the dry machining is performed without supplying the grinding fluid to the chamfered portion. However, the wet machining may be performed by supplying an appropriate grinding fluid.

Further, in each embodiment, the grinding stone 5
Although diamond abrasive grains are used as the abrasive grains, other materials capable of grinding the peripheral edge 1b of the lens 1 may be used. In addition, although urethane rubber is used as the elastic material binding material of the abrasive grains of the grindstone 5, another material capable of holding the abrasive grains while having the same degree of elasticity may be used.
Further, the region of the grindstone 5 composed of the abrasive grains and the elastic material binder may be either only the vicinity of the grindstone surface 5c or the entire grindstone 5, or either structure.

The technical idea having the following configuration is derived from the above specific embodiment. (Supplementary Note) (1) In a method of chamfering a lens by bringing a rotating grindstone into contact with the circumferential periphery of the rotating lens and grinding the periphery of the lens, abrasive grains are held by an elastic material binder. The chamfering process of the lens is characterized in that the grinding wheel, which is in contact with the peripheral edge of the lens, is elastically deformed by using a grinding wheel having the above structure, and the processing is performed by fixing the positional relationship between the grinding stone and the lens until the processing is completed. Method.

(2) The method for chamfering a lens as described in appendix (1), wherein the processing is performed such that the tangent to the peripheral edge of the lens in the processing portion is perpendicular to the tangent to the surface of the grindstone.

(3) In the method of chamfering the periphery of the lens, the step of rotating the grindstone holding the abrasive grains by the elastic material binder and the lens, and applying the grindstone to the periphery of the lens. A step of fixing in a state of being brought into contact with and elastically deforming, and a step of processing the periphery of the lens until the elastic deformation of the grinding stone is restored while the positional relationship between the grinding stone and the lens is fixed. A lens chamfering method.

(4) The grinding wheel has a substantially conical shape, the rotation axis of the grinding wheel is orthogonal to the rotation axis of the lens, and the grinding wheel is brought into contact with the periphery of the lens. ).

(5) The grinding wheel has a substantially disk shape, the rotation axis of the grinding wheel and the rotation axis of the lens are inclined at a desired angle, and the outer peripheral surface of the grinding stone is brought into contact with the periphery of the lens. The method for chamfering a lens according to claim 3, characterized in that:

(6) The thickness of the grinding stone is substantially the same as the width of the chamfer of the lens.
3. The method for chamfering a lens according to item 1.

(7) In a lens chamfering apparatus for chamfering the periphery of a lens, a first rotating mechanism for rotating the lens and a grindstone holding abrasive grains by an elastic material binding material. A second rotation mechanism, an advancing and retreating mechanism that can be fixed at at least two places in a state where the grinding stone is brought into contact with the periphery of the lens and elastically deformed and the grinding stone is separated from the periphery of the lens.
A chamfering apparatus for a lens, comprising:

(8) The supplementary note (7), wherein the grinding wheel has a substantially conical shape, and a rotation axis of the first rotation mechanism is orthogonal to a rotation axis of the second rotation mechanism. A chamfering apparatus for a lens as described in the above.

(9) The grinding wheel has a substantially disk shape. When the grinding wheel is brought into contact with the periphery of the lens, the rotation axis of the first rotation mechanism and the rotation axis of the second rotation mechanism are desired. The lens chamfering apparatus according to (7), wherein the lens is inclined at an angle.

(10) The grinding wheel is substantially disk-shaped, and the tangent to the periphery of the lens in the processing portion and the tangent to the grinding wheel surface of the grinding wheel are arranged so as to be orthogonal to each other. Lens chamfering device.

(11) The apparatus for chamfering a lens according to (9), wherein the thickness of the grinding stone is substantially the same as the width of the chamfered portion of the lens.

According to the lens chamfering method (1), there is an effect that the chamfering can be performed without moving the grindstone at the time of the machining and fixing the positional relationship between the grindstone and the lens. Therefore, in the chamfering processing of the lens, by omitting a mechanism for gradually moving the lens or the grindstone during the processing, there is an effect that the configuration of the chamfering apparatus and the process of the chamfering processing can be simplified. Further, an effect is obtained in which an excessive load is not applied to the lens and pitching and chipping are less likely to occur in the chamfered portion.

According to the lens chamfering method (2), the chamfering process is performed without fine adjustment of the fixed position between the grindstone and the lens so that the width of the grindstone surface of the grindstone and the width of the chamfered portion of the lens coincide with each other. The effect that can be performed is produced. Also, the entire grinding wheel surface can be worn uniformly,
This has the effect of making the work of correcting the shape of the grinding stone unnecessary.
Furthermore, the angle of the chamfer of the lens can be adjusted by adjusting the positional relationship between the grindstone and the lens without using a grindstone having a different shape and without providing a mechanism for inclining the grindstone axis. The effect that can be performed.

According to the lens chamfering method (3), there is an effect that the chamfering can be performed without moving the grindstone at the time of the machining and fixing the positional relationship between the grindstone and the lens. Therefore, in the chamfering processing of the lens, by omitting a mechanism for gradually moving the lens or the grindstone during the processing, there is an effect that the configuration of the chamfering apparatus and the process of the chamfering processing can be simplified. Further, an effect is obtained in which an excessive load is not applied to the lens and pitching and chipping are less likely to occur in the chamfered portion.

According to the lens chamfering method (4), by adjusting the positional relationship for fixing the grindstone and the lens, it is possible to cope with the chamfering of lenses having different sizes.

According to the lens chamfering method (5), the angle of the chamfer can be machined to a desired angle.

According to the lens chamfering method (6), it is possible to reduce the weight of the grindstone and to prevent vibration due to the ubiquitous weight of the grindstone. In addition, the entire grinding wheel surface of the grinding wheel can be uniformly worn, so that an effect of making the work of correcting the grinding wheel shape unnecessary is achieved.

According to the lens chamfering apparatus (7), the mechanism for gradually moving the lens or the grindstone during the processing is omitted in the lens chamfering processing, whereby the configuration of the chamfering apparatus and the process of the chamfering processing are reduced. Is achieved. Further, an effect is obtained in which an excessive load is not applied to the lens and pitching and chipping are less likely to occur in the chamfered portion.

According to the lens chamfering apparatus (8), by adjusting the positional relationship for fixing the grindstone and the lens, it is possible to cope with the chamfering of lenses having different sizes.

According to the lens chamfering apparatus (9), the angle of the chamfer can be machined to a desired angle.

According to the lens chamfering apparatus of the appendix (10), the chamfering is performed without fine adjustment of the fixed position of the grindstone and the lens so that the width of the grindstone surface of the grindstone and the width of the chamfered portion of the lens are made to coincide. The effect that can be performed is produced.
In addition, the entire grinding wheel surface of the grinding wheel can be uniformly worn, so that an effect of making the work of correcting the grinding wheel shape unnecessary is achieved. Furthermore, the angle of the chamfer of the lens can be adjusted by adjusting the positional relationship between the grindstone and the lens without using a grindstone having a different shape and without providing a mechanism for inclining the grindstone axis. The effect that can be performed.

According to the lens chamfering apparatus (11), it is possible to reduce the weight of the grindstone and to prevent vibration due to the ubiquitous weight of the grindstone. Further, there is an effect that the load on the processing device can be reduced.

[0083]

As described above, according to the first aspect of the present invention,
According to the method of chamfering a lens, there is an effect that the chamfering can be performed without moving the grindstone at the time of the processing and fixing the positional relationship between the grindstone and the lens. Therefore, in the chamfering processing of the lens, by omitting a mechanism for gradually moving the lens or the grindstone during the processing, there is an effect that the configuration of the chamfering apparatus and the process of the chamfering processing can be simplified. Further, an effect is obtained in which an excessive load is not applied to the lens and pitching and chipping are less likely to occur in the chamfered portion.

According to the lens chamfering method of the second aspect of the present invention, the same effect as the lens chamfering method of the first aspect can be obtained. Furthermore, there is an effect that the chamfering can be performed without finely adjusting the fixing position of the grindstone and the lens so that the width of the grindstone surface of the grindstone and the width of the chamfered portion of the lens match. In addition, the entire grinding wheel surface of the grinding wheel can be uniformly worn, so that an effect of making the work of correcting the grinding wheel shape unnecessary is achieved. Furthermore, the angle of the chamfer of the lens can be adjusted by adjusting the positional relationship between the grindstone and the lens without using a grindstone having a different shape and without providing a mechanism for inclining the grindstone axis. The effect that can be performed.

Further, according to the method for chamfering a lens according to the third aspect of the present invention, the same effect as that of the method for chamfering a lens according to the first or second aspect can be obtained.
Further, it is possible to reduce the weight of the grindstone and to prevent vibration due to the ubiquitous weight of the grindstone.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a chamfering apparatus used in Embodiment 1 of the present invention.

FIG. 2 is a front sectional view showing a processing step according to the first embodiment of the present invention, in which (a) is a step of rotating a grindstone and a lens,
(B) fixing the whetstone in an elastically deformed state,
(C) is a step of processing the periphery of the lens.

3A and 3B are enlarged cross-sectional views showing a contact portion between a lens and a grindstone at the time of chamfering, wherein FIG. 3A is a state of FIG. 2B and FIG. 2B is a state of FIG.

FIG. 4 is a front sectional view showing a chamfering apparatus used in Embodiment 2 of the present invention.

FIG. 5 is a front sectional view showing a processing step according to the second embodiment of the present invention, in which (a) is a step of rotating a grindstone and a lens,
(B) is a step of fixing the whetstone in an elastically deformed state,
(C) is a step of processing the periphery of the lens.

FIG. 6 is a front sectional view showing a main part of a chamfering process according to a third embodiment of the present invention.

FIG. 7 is a front sectional view showing a chamfering apparatus used in Embodiment 4 of the present invention.

FIG. 8 is a side sectional view showing a chamfering apparatus used in Embodiment 4 of the present invention.

FIG. 9 is a perspective view showing a main part of a chamfering process according to a fifth embodiment of the present invention.

FIG. 10 is a front sectional view showing a conventional chamfering apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens 1b Perimeter 1c Chamfering part 2 Lens holding plate 3 Work axis 4 Chuck 5 Grinding stone 5b Contact part 5c Grinding stone surface 6 Grinding stone shaft 8 Grinding stone shaft support base 10, 11 Bearing 21 Work axis driving motor 22 Grinding stone axis driving motor

Claims (3)

[Claims] 1. A lens chamfering method for chamfering a peripheral edge of a lens, comprising: a step of rotating a grinding stone having abrasive grains held by an elastic material binder and the lens; and contacting the grinding stone with the peripheral edge of the lens. And fixing the elastically deformed state, and processing the peripheral edge of the lens until the elastic deformation of the grindstone is restored while the positional relationship between the grindstone and the lens is fixed. A chamfering method for a lens. 2. In the step of processing the periphery of the lens,
2. The method for chamfering a lens according to claim 1, wherein a tangent to a periphery of the lens is orthogonal to a tangent to a grindstone surface of the grindstone. 3. The method for chamfering a lens according to claim 1, wherein the grinding wheel has a disk shape.